arch: arm: bpf: Converting cBPF to eBPF for arm 32 bit

Daniel Borkmann daniel at
Tue Mar 28 17:00:08 PDT 2017

Hi Shubham,

On 03/28/2017 10:49 PM, Shubham Bansal wrote:
> Do you have any document to understand the working of tail calls? I
> looked at your presentations but it seemed confusing to me. Anything
> simple would be great, just about the tail calls. I don't think I need
> examples, I can get them from your presentations. I just need a very
> general idea. May be you know the code in kernel where it is
> implemented.

Sure, it's in __bpf_prog_run(), see the JMP_TAIL_CALL (kernel/bpf/core.c +1019).
That's effectively what JITs implement. [1] page 3 has a high-level description
as well, hope that helps.



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